Writing instrument



FIG. 1 is a perspective view of a writing instrument showing our new design;

FIG. 2 is a perspective view of the writing instrument shown by itself without the cap for convenience;

FIG. 3 is a front view thereof with the cap;

FIG. 4 is a back view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a left view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings of FIGS. 1 and 3-8 are included for the purpose of illustrating a feature that forms no part of the claimed design. 

CLAIM The ornamental design for writing instrument, as shown and described. 